consequences of no primer?

[myunghoon]

honestly...being an amateur and all, i don't know the importance of primer. you guys say that it helps the paint stick to the plastic, but i have not seen any consequences in my current models (i've had them for about a year now).

i can see how not primering a real car might result in things like peeling...but these are just models.

so...what's supposed to happen if you don't primer-ify your car?

[TURBO_EK4]

I've never used primer in my eight or so years of builiding models. Havent had any problems with any of my paint jobs yet.

[hirofkd]

What people mean by paint adhesion is not because of paint peeling off, but the primer prevents paint from flowing away from the edges and ridges, allowing paint to be applied thinner. The difference between non-primed and primed body is less important for dark body colors, but for light colors and metallic, it will be more significant. There're many more things to go wrong, if the primer isn't used.

[youngdrifter_x]

there are some consequences...like if the bumpers and some stuff is different color than the car, there will be a color difference. My Silvia was came like that and ended up with dark bumpers and side skirts.

[primera man]

This topic has been done over and over and over again and starts to become a real pain in the arse.

If you dont want to use it....DONT BOTHER THEN !!!

What is primer? Do I have to use it?

Primer is a filler and a barrier coat, preparing the plastic to grip the paint, filling scratches and imperfections, as well as neutralizing any incompatibility between the paint and plastic. Automotive plastic primer is the best choice, as it is suitable for any top coat and comes in white or gray. Also available in clear though that has no filling properties. ‘Key’ the plastic by rubbing the whole body with 800 grade wet & Dry paper, then apply up to three coats of primer. Then leave for 24 hours, smooth with 1200 grade paper, then add the top coats.

Also, the primer coat will help you find any small imperfections in the plastic or mold before you continue. As you sand it after the first light coat, the sandpaper will naturally take primer off the high points. These high points must be sanded flush with their surroundings, or else you will polish right through your paint job in these spots!

[myunghoon]

i'm sorry. i wasn't asking what it was for...i sorta got the jist.

i just wanted to know if anyone saw any consequences of having not used primer, cuz i haven't seen any thus far.

[hirofkd]

Don't worry. Eventually, you'll screw up and start using primer as a precaution. That's how primier people have learned including myself.

[gasman03]

there are zero consequences to using no primer using Tamiya paint, got some kits that where painted 3 years ago with Tamiya and no primer and they look as good as the day I painted them.

in fact, I rarely use primer with Tamiya, BUT, you MUST use primer if your using Plasti-cote, Duplicolor, and other automative laquers, they could burn through the styrene, I've seen it happen

[Vric]

it all depend of what paint, what color and what you do to your kit

lately, I use lot of putty and resin part for modify my kits, so Primer isn't even an option, you need it.

if you use light color, primer is a great addon

if you use some color like tamiya Silver leaft or some other, primer is useless (you can praticly use Silver leaft as a primer ;-)))

but some paint really need primer, like Tamiya White color (they aren't covering that great)

[TanKaBoY]

yes ive read this link
http://www.automotiveforums.com/vbul...991#post578991 about primer

but is it just like an undercoat or something?
because i've just been spraypainting the body with out primer , is that good or bad?

[primera man]

[TanKaBoY]

do u know a good size for tweezers are?

[pettercardoso]

Arghh!
What's up with these guys?! Do they ever read anything around here?!...

[Jay!]

from: A Treatise On Paint

Originally Posted by daggerlee

The importance of primer

Primer serves a multitude of purposes. For one, some paints are transluscent - the color they are applied over affects the color of the paint. Try painting red color over black, see how well it goes. A good primer will give a solid base color for the overlying color. In this manner, primers can be almost any color that, when combined with the color coat, would give the desired color. For example, red over white = bright red, red over black = blood red, white over white = white, white over black = grey, etc.

Second, the carrier and pigment of paints usually stick to primer better than plastic. themodelkid says that imagine climbing a wall - you want it to be jutted and cragged so you have something to hold onto, right? Same principle with primer, the paint sticks better to the flat, uneven surface. But don't make it too uneven or it will show through - hence why some people sand their primer with 1500 grit prior to painting.

Third, primers form a protective barreir between the plastic, and some of the harsher paints.

[hirofkd]

Easy easy, it's a good sign to see new people getting interested in car modeling.

The reason why I use primer is because of my modeling style.
1) I sand and erase the seam lines. Files and sand papers leave scratches.
2) I spot paint the scratched areas with mr. surafcer, whose color is different from the body.
3) I fill sink marks and correct manufacturing inperfections with solvent putty and super glue.
4) Primer equalize the differences in color and material.
5) Primer blocks the light, eliminating the cheap look of plastic, and also hide the difference in thickness of plastic.
6) primer helps highlighting flaws need to be corrected.
7) primer helps paint grab the surface

There're many other reasons, but in case you are wondering, just build a car and paint it yellow without using primer.